﻿MoUasca 
  from 
  Feru 
  and 
  Argentina. 
  525 
  

  

  aperture 
  rouglilj 
  subtriangular 
  ; 
  operculum 
  liarp-sliaped, 
  

   concave, 
  horny, 
  laminiferons, 
  granular, 
  very 
  dark 
  chestnut 
  

   shading 
  to 
  a 
  paler 
  hue 
  towards 
  the 
  laterally 
  placed 
  nucleus. 
  

  

  Alt. 
  4"5, 
  diam. 
  maj. 
  7'5, 
  diam. 
  min. 
  6 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  3, 
  diam. 
  3'25 
  mm. 
  

  

  Hah. 
  Rio 
  Pucaya, 
  Eastern 
  Peru. 
  

  

  Helicina 
  contamanoensis, 
  sp. 
  n. 
  

  

  Shell 
  broadly 
  conoid, 
  polished, 
  shining, 
  dark 
  yellowish 
  

   flesh-colour 
  ; 
  vviiorls 
  5, 
  not 
  very 
  convex, 
  regularly 
  increasing, 
  

   the 
  last 
  acutely 
  carinate, 
  gradually 
  descending 
  in 
  front, 
  

   maiked 
  with 
  arcuate 
  growth-lines 
  and 
  sculptured 
  with 
  very 
  

   fine, 
  confused, 
  oblique 
  strias 
  and 
  distant 
  spiral 
  ridges 
  ; 
  suture 
  

   lightly 
  impressed, 
  narrowly, 
  callously 
  margined 
  below; 
  

   columella 
  white, 
  descending 
  obliquely, 
  and 
  developed 
  into 
  an 
  

   outwardly 
  directed, 
  nodular 
  projection 
  at 
  the 
  base, 
  outwardly, 
  

   callously 
  diffused 
  above 
  into 
  a 
  thin, 
  well-defined, 
  granular, 
  

   parietal 
  callus 
  ; 
  labrura 
  white, 
  narrowly 
  expanded 
  and 
  re- 
  

   flexed 
  especially 
  below, 
  coarsely 
  granular, 
  receding 
  towards 
  

   the 
  base, 
  outwardly 
  extended 
  above 
  ; 
  aperture 
  broadly 
  

   sagittiform 
  ; 
  operculum 
  corneous, 
  slightly 
  concave, 
  some- 
  

   what 
  granular, 
  laminiferous, 
  with 
  lateral 
  nucleus, 
  reddish- 
  

   chestnut 
  shading 
  to 
  dark 
  yellow 
  towards 
  the 
  nucleus. 
  

  

  Alt. 
  9, 
  diam. 
  maj. 
  15, 
  diam. 
  min. 
  12'5 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  5, 
  diam. 
  6*5 
  mm. 
  

  

  Bab. 
  Contamano, 
  Rio 
  Ucayali, 
  Eastern 
  Peru. 
  

  

  Allied 
  to 
  H. 
  rhyncostoma 
  (Shuttl.), 
  P£r. 
  *, 
  but 
  with 
  nar- 
  

   rower 
  and 
  higher 
  aperture 
  ; 
  moreover, 
  the 
  spire 
  is 
  not 
  

   laterally 
  concave 
  as 
  in 
  that 
  species. 
  

  

  Helicina 
  inca, 
  sp. 
  n. 
  

  

  Shell 
  allied 
  to 
  H. 
  contamanoensis., 
  Preston, 
  but 
  differing 
  from 
  

   that 
  species 
  in 
  its 
  more 
  depressedly 
  conoid 
  form 
  and 
  greenish- 
  

   yellow 
  colour, 
  and 
  in 
  being 
  painted 
  with 
  a 
  narrow, 
  reddish, 
  

   subcarinal 
  band 
  j 
  the 
  last 
  whorl 
  does 
  not 
  descend 
  so 
  much 
  in 
  

   front, 
  and 
  the 
  distant 
  spiral 
  ridges 
  of 
  H. 
  contamanoensis 
  give 
  

   place 
  to 
  rather 
  closely-set, 
  impressed, 
  spiral 
  lines, 
  while 
  the 
  

   base 
  of 
  the 
  shell 
  is 
  sculptured 
  with 
  fine, 
  closely-set, 
  revolving 
  

   strise 
  ; 
  the 
  columella 
  is 
  more 
  excavated 
  and 
  is 
  quite 
  rounded, 
  

   lacking 
  the 
  nodular 
  projection 
  at 
  the 
  base 
  ; 
  the 
  aperture 
  is 
  

   rather 
  less 
  broadly 
  sagittiform 
  and 
  the 
  labrum 
  is 
  rather 
  less 
  

   outwardly 
  expanded 
  than 
  is 
  the 
  case 
  in 
  that 
  species. 
  

  

  « 
  Shuttleworth 
  in 
  PfeitFer, 
  Mon. 
  Pneum. 
  iii. 
  1865, 
  p. 
  245, 
  

  

  